Stuff the numbers, what was the overall percentage that you paid? Then you can compare permie tax to contractor tax. I wager you paid a lower rate than a higher rate permie? I paid well over double your NI and income tax.
You kept a small accountancy firm in business? Another tax dodger no doubt...
It's time to scrap the complex Income / Corporation tax / NI nonsense and replace it with a graduated rate for all income.
Sick pay is biggest bogus argument I've heard in my life - I reckon have had 10 days off sick in the past 20 years.